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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Xingyu, Liu, Youquan, Molokeev M. S., Xu, Bohui, Jiang, Xingxing, Lin, Zheshuai
Заглавие : Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy
Колич.характеристики :6 с
Место публикации : Angew. Chem. - 2024. - Vol. 136, Is. 7. - Ст.e202318401. - ISSN 00448249 (ISSN), DOI 10.1002/ange.202318401. - ISSN 15213757 (eISSN)
Примечания : Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ≈0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Xingyu, Liu, Youquan, Molokeev M. S., Xu, Bohui, Jiang, Xingxing, Lin, Zheshuai
Заглавие : Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy
Колич.характеристики :6 с
Место публикации : Angew. Chem. Int. Ed. - 2024. - Vol. 63, Is. 7. - Ст.e202318401. - ISSN 14337851 (ISSN), DOI 10.1002/anie.202318401. - ISSN 15213773 (eISSN)
Примечания : Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006)
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ~0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.
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Вид документа : Статья из журнала
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Автор(ы) : Dudnikov V. A., Orlov Yu. S., Solovyov L. A., Vereshchagin S. N., Ustyuzhanin Yu. N., Zharkov S. M., Zeer G. M., Borus A. A., Bondarev V. S., Ovchinnikov S. G.
Заглавие : Crystal structure and thermoelectric properties of mechanically activated LaCoO3
Место публикации : J. Taiwan Inst. Chem. Eng. - 2024. - Vol. 162. - Ст.105560. - ISSN 18761070 (ISSN), DOI 10.1016/j.jtice.2024.105560. - ISSN 18761089 (eISSN)
Примечания : Cited References: 88. - This study was supported by the Russian Science Foundation , project no. 24-22-00091
Аннотация: Background: Crystal structure of rare-earth LaCoO3 cobalt oxide subjected to high energy mechanical activation has been studied. In the temperature range of 300–800 K, the electrical conductivity and Seebeck coefficient were measured. Thermal conductivity was measured at 300–480 K. Methods: Comparative analysis of thermoelectric properties of the samples prepared by standard solid-state reaction and using high-energy mechanical activation was carried out. Findings: It was found that the experimental X-ray diffraction patterns are best described within the model that allows the coexistence of two domains in samples with the same crystal symmetry, but different lattice a and c parameters. The percentage ratio of these domains in the samples depends significantly on the size of the initial particles in the solid-state synthesis reaction and the annealing temperature. Mechanical activation and increase of synthesis temperature result in change of Seebeck coefficient sign and significant decrease of electrical resistivity. The Seebeck coefficient of non-activated samples takes positive values over the entire temperature range and decreases monotonically with increasing temperature, in contrast to mechanically activated samples exhibiting ambipolar behavior.
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Вид документа : Статья из журнала
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Автор(ы) : Gudim I. A., Mikhashenok N. V., Vasiliev A. D., Melnikova S. V., Pavlovskii M. S., Skorobogatov S. A., Pankrats A. I.
Заглавие : Features of the melt–solution synthesis of the TbCr3(BO3)4 single crystals
Колич.характеристики :6 с
Место публикации : J. Cryst. Growth. - 2024. - Vol. 637-638. - Ст.127716. - ISSN 00220248 (ISSN), DOI 10.1016/j.jcrysgro.2024.127716. - ISSN 18735002 (eISSN)
Примечания : Cited References: 22. - The authors thank A.V. Zamkov for assistance in preparing the samples for the conoscopic study. The characterization and examination of the samples were performed at the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of SciencesThis study was supported in part by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 22-12-20019
Аннотация: The phase formation of terbium chromoborate TbCr3(BO3)4 in the bismuth trimolybdate and lithium tungstate melt–solutions has been studied. The absence of the terbium chromoborate trigonal phase in the bismuth trimolybdate-based system at all component ratios has been shown. The component ratio in the lithium tungstate-based system has been found at which the TbCr3(BO3)4 trigonal crystals are formed at temperatures above 1100 °C; below this temperature, the monoclinic phase dominates. The structural and magnetic properties of the grown crystals have been studied. It has been established that the trigonal and monoclinic TbCr3(BO3)4 crystals synthesized from the lithium tungstate-based solvent exhibit identical magnetic properties. At the same time, a significant difference of the magnetic properties of the single crystals synthesized from the bismuth molybdate melt–solution has been observed. This difference has been attributed to the effect of Bi3+ ions that partially replace Tb3+ ions.
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Вид документа : Статья из журнала
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Автор(ы) : Moshkina E. M., Molokeev M. S., Eremin E. V., Bezmaternykh L. N.
Заглавие : Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)2O3 bixbyite
Колич.характеристики :6 с
Коллективы : Nanophysics and Nanoelectronics, International Symposium
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P.1009-1014. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.06.56116.57. - ISSN 10906460 (eISSN)
Примечания : Cited References: 17. - This study was supported by grant № 21-72-00130, provided by the Russian Science Foundation (https://rscf.ru/project/21-72-00130/.)
Аннотация: To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at T = 20 – 32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Dudnikov V. A., Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : Features of spin crossovers in magnetic materials
Колич.характеристики :26 с
Место публикации : Phys. Usp. - 2023. - Vol. 66, Is. 7. - P.647-672. - ISSN 10637869 (ISSN), DOI 10.3367/UFNe.2022.05.039195. - ISSN 14684780 (eISSN)
Примечания : Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.
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Вид документа : Статья из журнала
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Автор(ы) : Верещагин, Сергей Николаевич, Дудников, Вячеслав Анатольевич, Рабчевский, Евгений Владимирович, Соловьев, Леонид Александрович
Заглавие : Особенности формирования перовскитоподобных фаз Раддлесдена — Поппера на основе редкоземельных оксидов
Колич.характеристики :6 с
Место публикации : Труды Кольского научн. центра РАН. Сер. технич. науки. - 2023. - Vol. 14, Is. 3. - С. 76-81. - ISSN 29491215 (ISSN), DOI 10.37614/2949-1215.2023.14.3.013; Trans. Kola Sci. Centre RAS. Ser. Eng. Sci.
Примечания : Библиогр.: 14. - Статья выполнена при поддержке федерального бюджета по теме государственного задания Института химии и химической технологии ФИЦ КНЦ СО РАН № 0287-2021-00-13 с использованием оборудования Красноярского регионального центра коллективного пользования ФИЦ КНЦ СО РАН
Аннотация: В работе с использованием доступных в литературе термодинамических данных исследована зависимость величины ∆G0n,f (стандартной свободной энергии Гиббса образования фаз Раддлесдена — Поппера RPn) от значения параметра n в ряду AO∙(ABO3)n, где A = Са, Sr, Ba, La; B = Co, Ni, Ti, Zr, Hf. Обнаружено, что величина ∆G01/n,f фаз RPn для всех изученных систем линейно зависит от 1/n. Проанализированы следствия существования линейной зависимости с позиций проведения синтеза фаз RPn. На примере стронцийредкоземельных кобальтитов состава (SrxLn1-x)n+1СоnO3n+1 (Ln = Sm, Gd, Dy; n = 2, ∞) продемонстрирована возможность получения фаз RPn с различным характером распределения катионов Sr/Ln по А-позициям кристаллической решетки, приведены условия стабилизации новых метастабильных фаз (SrxLn1-x)3Со2O7-δ, отсутствующих на фазовых диаграммах.The dependence of the value of ∆G0n,f (the standard Gibbs free energy of Ruddlesden-Popper RPn phase formation) on the n-value in the series AO∙(ABO3)n (where A = Ca, Sr, Ba, La; B = Co, Ni, Ti, Zr, Hf) was analyzed using the thermodynamic data available in the literature. It is found that the value of ∆G01/n,f for all analyzed systems depends linearly on 1/n. The consequences of the existence of the linear dependence are analyzed from the point of view of carrying out the synthesis of the RPn phases. On the example of strontium-rare-earth cobaltites of the composition (SrxLn1-x)n+1СоnO3n+1 (Ln = Sm, Gd, Dy; n = 2, ∞), the possibility of obtaining RPn phases with a different character of the distribution of Sr/Ln cations over the A-positions of the crystalline lattice, stabilization conditions for new metastable phases (SrxLn1-x)3Со2O7-δ, which are absent in the phase diagrams in air, are given.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Seryotkin, Yurii, Bayukov O. A., Molokeev M. S., Kokh, Dieter, Smorodina, Ekaterina, Krylov A. S., Bezmaternykh L. N.
Заглавие : Flux growth and phase diversity of the triple oxides of transition metals (Mn,Fe,Ga)2O3 in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O
Колич.характеристики :11 с
Место публикации : CrystEngComm. - 2023. - Vol. 25, Is. 18. - P.2824-2834. - ISSN 14668033 (eISSN), DOI 10.1039/D3CE00147D
Примечания : Cited References: 38. - The study was supported by the Russian Science Foundation (grant no. 21-72-00130)
Аннотация: To determine the mutual influence of the solvent and soluble in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O, the crystallization of the triple oxides of the transition metals (Mn,Fe,Ga)2O3 is investigated, namely the phases based on orthorhombic FeGaO3 and bixbyite FeMnO3. Simultaneously, a set of fluxes is studied based on the variation in the component ratio with regard to the solvent and soluble. The crucial role of various components of the flux system is considered at the intersection of the phase boundaries. Fluxes for the stable growth of (Mn,Fe,Ga)2O3 single crystals of the studied phases (based on orthorhombic FeGaO3 and bixbyite FeMnO3) are determined. A set of single crystal samples (9 samples) with different Fe/Mn/Ga ratios is obtained. The actual composition of the samples is studied using the EDX technique. The partition coefficients of Fe2O3, Mn2O3 and Ga2O3 in the studied fluxes are analyzed. The structure of the obtained samples is characterized using X-ray diffraction methods, including the phase composition, space group and lattice parameters. The room temperature Raman spectra of the obtained samples are presented. The distribution of iron cations over the crystal positions in the obtained phases is studied using Mossbauer spectroscopy.
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Вид документа : Статья из журнала
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Автор(ы) : Kurilova A. V., Sokolov A. Е., Sukhachev A. L., Ivanova O. S., Bogdanov K. V., Baranov M. A., Dubavik A. Y.
Заглавие : Synthesizing antiferromagnetic α-Fe2O3–rGO discs: Their magnetic and magneto-optical properties
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P.610-613. - ISSN 10628738 (ISSN), DOI 10.3103/S106287382205015X
Примечания : Cited References: 26
Аннотация: A comprehensive study is performed of the properties of hybrid structures of iron oxide and reduced graphene oxide α-Fe2O3/rGO synthesized via “wet mixing.” It is shown that hematite nanoparticles with a comparatively uniform distribution can be encapsulated in graphene layers, and the way of preparing precursors is of critical importance in shaping the magneto-optical properties of α-Fe2O3/rGO hybrid structures.
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Вид документа : Статья из журнала
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Автор(ы) : Samoshkina Yu. E., Petrov D. A., Chou H.
Заглавие : Low-hydrogenated ZnCoAlO films: structure, magneto-optical and magnetic behavior
Место публикации : Appl. Phys. A. - 2022. - Vol. 128, Is. 6. - Ст.519. - ISSN 09478396 (ISSN), DOI 10.1007/s00339-022-05665-z
Примечания : Cited References: 16. - This research was funded by the Russian Science Foundation Grant No. 21-72-00061
Аннотация: Morphology, chemical composition, crystal structure, and magnetic circular dichroism of ZnO films doped simultaneously with Co and Al (CAZO) have been studied. The films were deposited on glass substrates by the RF magnetron sputtering of the Zn0.93Co0.05Al0.02O target. Low hydrogen concentrations of 1–4% were used in mixed Ar + H2 atmosphere together with high enough substrate temperature of 450 °C. A tendency to a decrease in the Zn amount and an increase in the relative Co and Al content in the films has been revealed in the presence of hydrogen in the atmosphere. The structural data of the studied films correlate well with those for high-hydrogenated (20–50% H2) CAZO films deposited under the same conditions and studied earlier. The new data indicate the prospect of obtaining ferromagnetic samples based on ZnO without any secondary phases.
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